o Major bugfixes (congestion control, TROVE-2022-001):
    - Fix a scenario where RTT estimation can become wedged, seriously
      degrading congestion control performance on all circuits. This impacts
      clients, onion services, and relays, and can be triggered remotely by a
      malicious endpoint. Tracked as CVE-2022-33903. Fixes bug 40626; bugfix
      on 0.4.7.5-alpha.